From October 1992 the barcode sticker reads xx-xxxxx-xx: a year, a sequence number and a week. Stickers of this type were used until July 1997.
Two stickers carried Marshall's build date after the letter system ended: the barcode label from October 1992 and the date bar from August 1997.
From October 1992 the barcode sticker reads xx-xxxxx-xx: a year, a sequence number and a week. Stickers of this type were used until July 1997.
From August 1997 a printed date bar carries the country letter, the year, the week, a four-digit sequence and a voltage letter, in the form M-YYYY-WW-NNNN-V.
Country letters mark where the amp was made and voltage letters mark the mains variant. Both belong to the same date bar and should be read together with the date.
On the rear of the chassis or the head shell; amps built across the changeover can carry both sticker types.
Two characters for the year, five for the sequence and two for the week in the xx-xxxxx-xx layout.
Country letter, year, week, sequence and voltage letter, separated by dashes.
Barcode stickers stop in July 1997 and date bars start in August 1997, which brackets the changeover.
October 1992 – July 1997 · 6 rows
| Prefix | From | To | Years | Source |
|---|---|---|---|---|
| 92-xxxxx-xx | 92-xxxxx-xx | 1992 | Amp Archives — Marshall serial numbers | |
| 93-xxxxx-xx | 93-xxxxx-xx | 1993 | Amp Archives — Marshall serial numbers | |
| 94-xxxxx-xx | 94-xxxxx-xx | 1994 | Amp Archives — Marshall serial numbers | |
| 95-xxxxx-xx | 95-xxxxx-xx | 1995 | Amp Archives — Marshall serial numbers | |
| 96-xxxxx-xx | 96-xxxxx-xx | 1996 | Amp Archives — Marshall serial numbers | |
| 97-xxxxx-xx | 97-xxxxx-xx | 1997 | Amp Archives — Marshall serial numbers |
The year, the sequence number and the week, in the form xx-xxxxx-xx, used from October 1992 to July 1997.
The date bar introduced in August 1997: country letter, year, week, sequence number and voltage letter.
Check the date: before July 1997 it is the barcode label, after August 1997 the date bar, and some amps carry both.